名校
1 . 某地拟规划种植一批芍药,为了美观,将种植区域(区域Ⅰ)设计成半径为
的扇形
,中心角
.为方便观赏,增加收入,在种植区域外围规划观赏区(区域Ⅱ)和休闲区(区域Ⅲ),并将外围区域按如图所示的方案扩建成正方形
,其中点
,
分别在边
和
上.已知种植区、观赏区和休闲区每平方千米的年收入分别是10万元、20万元、20万元.
![](https://img.xkw.com/dksih/QBM/2019/6/28/2235426121187328/2235568013508608/STEM/30a50bbe07b2466fb7c90c4933ce7294.png?resizew=124)
(1)要使观赏区的年收入不低于5万元,求
的最大值;
(2)试问:当
为多少时,年总收入最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e4917c34a4c4e654ace35eb65f179b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38a6341dbb03ec2c0c10e5353a07c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea0fc279fa6f206ab79e71666417b483.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2019/6/28/2235426121187328/2235568013508608/STEM/30a50bbe07b2466fb7c90c4933ce7294.png?resizew=124)
(1)要使观赏区的年收入不低于5万元,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)试问:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
您最近一年使用:0次
2018-11-18更新
|
2211次组卷
|
8卷引用:江苏省徐州市2019届高三上学期期中质量抽测数学试题
2 . 某城市在进行规划时,准备设计一个圆形的开放式公园.为达到社会和经济效益双丰收.园林公司进行如下设计,安排圆内接四边形
作为绿化区域,其余作为市民活动区域.其中
区域种植花木后出售,
区域种植草皮后出售,已知草皮每平方米售价为
元,花木每平方米的售价是草皮每平方米售价的三倍. 若
km ,
km
(1)若
km ,求绿化区域的面积;
(2)设
,当
取何值时,园林公司的总销售金额最大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df6d51738ac1bc8b9530ea4a55745c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c41757ae282475fb29ec1e8e02045d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adce79579360c94699123b74bb2795ea.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1950345548fe750b80ce79b168969ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://img.xkw.com/dksih/QBM/2018/12/19/2100386859679744/2101590403235840/STEM/7c17c3d7af5640c7afd8cbb0d18e997d.png?resizew=153)
您最近一年使用:0次
3 . 如图,AOB是一块半径为r的扇形空地,
.某单位计划在空地上修建一个矩形的活动场地OCDE及一矩形停车场EFGH,剩余的地方进行绿化.若
,设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657d17e23a8eecc96aad16e6ede2ae5b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/1ce526ac-ff29-4716-9d2d-e537da028f97.png?resizew=185)
(Ⅰ)记活动场地与停车场占地总面积为
,求
的表达式;
(Ⅱ)当
为何值时,可使活动场地与停车场占地总面积最大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac51bffb8f476896081027b33f7ec25d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a0339aa52bcc961e84f60d4497ccdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657d17e23a8eecc96aad16e6ede2ae5b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/1ce526ac-ff29-4716-9d2d-e537da028f97.png?resizew=185)
(Ⅰ)记活动场地与停车场占地总面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5224a7da7fe6bc28971ce4c277f88588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5224a7da7fe6bc28971ce4c277f88588.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
您最近一年使用:0次
2018-12-14更新
|
1068次组卷
|
5卷引用:【市级联考】山东省泰安市2019届高三上学期期中考试数学(文)试题1
4 . 如图所示,在一半径等于1千米的圆弧及直线段道路
围成的区域内计划建一条商业街,其起点和终点均在道路
上,街道由两条平行于对称轴
且关于
对称的两线段EF、CD,及夹在两线段EF、CD间的弧组成.若商业街在两线段EF、CD上收益为每千米2a元,在两线段EF、CD间的弧上收益为每千米a元.已知
,设
,
(1)将商业街的总收益
表示为
的函数;
(2)求商业街的总收益的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f788fb0059b7356dc6c7811f46057e66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae7d29d4928c427ce72379eb0202678.png)
(1)将商业街的总收益
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd288d4152caf5fc8187a1a901c8949f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)求商业街的总收益的最大值.
![](https://img.xkw.com/dksih/QBM/2017/4/22/1671142035128320/1719208170930176/STEM/97ee320817af40d8b66620db77a1e8a4.png?resizew=189)
![](https://img.xkw.com/dksih/QBM/2017/4/22/1671142035128320/1719208170930176/STEM/fc1daec7aadd417285ff1238ce3593ff.png?resizew=189)
您最近一年使用:0次